Dies for cutting metal reenforcement



Sept. 4, 1923. 1,466,680

J. c. TIMM DIES -FOR CUTTING METAL REENFORCEMENT Filed Sent. 30. 1920 Swwmbo'z .fom $202 By M & %7

v Grim! Patented Sept. 4, 1923.

STA

1,456,680 PATENT OFFICE.

JOHN C. TIMIvI, or Yoonosrown, onro.

nrns roaourrine METAL annnrononmnnr.

Application filed-Septembertt), 1920. Serial No. 413,738.

To all whom it may concern: 1 f

Be it known that 1, JOHN C. TIMM, a citizen of the United States, and aresident of Youngstown, countyofMahoning, and State of Ohio, have invented afnew 'and useful Improvement in Dies for Cutting lvletal Reenforcements, of whichthe' following is a specification, the principle of the invention being herein explained and thebest modein which I have contemplated applying that principle, so'as to distinguishit from other inventions.

The presen-tinvention relates; to expanded meta-l suitable for use as reenl'orcement 1n concrete constructionor in the lighter grades as metal lath. More particularly the invention relates to the die mechanism for slitting the metal whereby waste is reduced .to

a minimum and theresultant expanded sheets enlarged per original weight of metal while maintaining the same weight per unit area in their expanded condition. The dies for slitting the metal are so formed asto give the required cut and so arranged that they maybe readily replaced and renewed as required. To the accomplishment of the foregoing and related ends, saidinvention,

then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one or" various mechanicalforms inwhich the principle of the invention may be used.

In said annexed drawing Fig. 1 is a plan view of a sheet ofmetal cut but not expanded; Fig. 2' is a similar plan view of an expanded sheet; Figs?) and l are end elevations of Figs. land 2, respectively; Figs. 5 .and 6 are plan views of assembled top and bottom dies; and Figs. 7

lie in substantially the same plane.

neoting link is severed or slit along the edge or the rib, the left hand out extending from the top of the link to a point adjacent the bottom thereof but leaving the u'nslit portion do :On the right hand side the slit i s,re-'

versed so as to leave similar unslit portion a at the top of the'link. Between links a portion is completelycut away leaving a rectangular openingdconnecting with the slits at the corners. This opening is as small as possible, being merely of a convenient size to allow for the proper cutting of the edges so that the metal may be completely'severed.

'On the link on the opposite side of the ribs the slit is reversed so that the two links on the opposite side of each rib have the unslit portion rib. v I

No metal is'cut'away and discarded except suiiicient to leave these rectangular openings 6 which open into. the slits at the edges of the ribs so that the waste metal is reduced to a minimum. The slits are clearly made along the edges of the ribs and the sheet is then expanded to the form shown in Fig. 2. The expanding operations bend the links so that they lie in a plane at almost right angles to the original planeof the metal and the pairs of unslit portions 4 This forms heels or spacingportions so that the ribs are spaced above bottom level of the sheet when in position as reenforcement.

To accomplish this slitting operation,

complementary die members are employed,

the top die member having a beveled end 10 to leave the right hand unslit portion of 1: iormingan integral piece with the.

the link. The lower end of this member has v a recess with a beveled edge 11 to leave the bottom unslit portion ofthe link and then a square solid portion which is raised and which makes the rectangular opening 6.

' The otheror stationary dies are formed with complementary projections 12 and square openings 13; The dies are formed and .mounted in pairs, the dies of each pair being reversed as to position as best shownin Figs. '5 and 6 to form the links with unslit portions in pairs on opposite, sides of the ribs.

These cutting dies are adapted to be mounted in a suitable form 14 being spaced apart by plain bars 15 to cover the ribs and may be readily inserted or replaced in the forms. Each member has end portions 16 reduced in height so as to fit under suitable frame members '17 of the form to hold the dies in place.

Heretotore, in cutting reinforcing metal to leave ribs connected by links, it has been necessary to cut away a considerable portion of the metal between successive ribs in the sheet and this metal is simply wasted. By the use of the present dies the only loss is caused by the square apertures which are reduced in size to a minimum. Each punch of the die may slit one entire series of links the entire width of the sheet and then the sheet may be advanced before the next operation of the diesthus facilitating the work of cutting or slashing the sheets preparatory to expanding. The ribs will be spaced apart thedesired width of the link and the slitting is along the edges-of the ribs whatever their shape. The width of the link should be sufiiciently greater than its thickness so that in expanding they twist and lie at almost right angles to the original plane of the sheet.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalentot such stated means be employed.

I therefore particularly point out and distinctly claim as my invention 1. A cutting die for expanded metal having one rectangular cutting end and a straight cutting'edge along one side, and being beveled oil at the other end, the other side being provided with a cut away portion having one edge at an angle to leave an uncut portion.

2, A cutting die for expanded metal having a raised rectangular cutting end, a cutting side lower than said raised end and ex tending therefrom to a point adjacent the other end of the die and then being beveled ofi to the other side, the other edge being formed with a cut away portion one side.

oi which is beveled similarly to the first beveled portion. 1 3. A cutting die for expanded metal provided with a rectangular cutting end a' cutting side extending from such rectangular portion to a point adjacent the other end of the die and then extending at an angle to the other edge. the other edge being termed with a cut away portion adjacent the rectangular end.

Signed by me, this Qe th day of September, 1920.

' JOHN e. TIMM. 

